Is Social share important for Bing ranking?

Like Google, Bing does not have its own social network. Does that indicate social share is not an important factor when it comes to ranking in Bing? Or its a other way around? If you have experience in this regard, share your views.

Google already owned social network aka Orkut and they closed due to the afraid of FBI and other things. Bing is partnered with Facebook as you see the search results in Facebook. These are my opinions and Facebook will die soon due to so many cases and no profits to them.